Specifying an H1 Compliant Membrane Roof on a Residential Project

On the 1st May 2023, MBIE’s fundamental changes to Clause H1 for all residential buildings come into effect. These changes relate to energy efficiency and the thermal performance of roofing elements in particular insulation.

The minimum roof R-Value has been increased in buildings under 300m² and is shown in the above table. With these considerable changes, Nuralite has seen a significant increase in queries to their technical team via phone and email, as well as through the Live Chat function of their website. The queries all have a similar subject — how can we ensure we meet the new R-Values in our roof designs?

Nuralite have a solution that has been tried and tested in the market for over 15 years. The CodeMark certified Nuratherm Warm Roof system can ensure you meet and exceed H1 requirements.

The 150mm Enertherm PIR provides a continuous R-Value of R6.80 ‘outside the structure’ and when combined with our NPM900 metal tray substrate, Nuralite can provide an economical and fast, H1 compliant roof for all Climate Zones.

Nuralite aims to make the roof build-up as efficient and effective as possible and it may be possible to include some lofted insulation inside the roof build up to reduce the amount of Enertherm PIR insulation overall. They can increase or decrease the thickness of the Enertherm PIR to suit.

The Nuratherm Warm Roof System can be specified with either Nuraply 3PM or Nuraply TPO. Nuralite can also undertake a Hygrothermal Analysis specific to your project and geographical location to ensure H1 requirements are met. You can view Nuralite's interactive 3D Nuratherm Warm Roof model on Working Spec.

Please contact Nuralite if you would like assistance with your next project.

Nuratherm Warm Roof System

Nuralite

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The Nuratherm system puts the insulation where it should be, above the substrate, to completely enclose the roof area with a highly efficient insulation blanket.

The Nuraply Nuratherm System has been appraised by BRANZ for use as an insulating roof on buildings within the following scope:

the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with regards to building height and maximum floor plan areas; and,
on limited access flat roofs with concrete, timber or steel structural decks subject to specific structural design; and,
with roofs constructed to drain water to gutters and drainage outlets complying with the NZBC; and,
with roofs constructed to suitable falls (Refer Paragraph 15.3 and 15.4); and,
with no integral roof gardens; and,
situated in NZ3 3604 Wind Zones, up to, and including 'Extra High'.

The Nuraply Nuratherm System has also been appraised for durability and thermal performance as an insulated roofing system on buildings that are the subject of specific design with no building height restriction. Building designers are responsible for the building design and for the incorporation of the Nuraply Nuratherm System into their design in accordance with the declared properties and instructions of Nuralite Waterproofing Ltd.

In the opinion of BRANZ , the Nuraply Nuratherm System, if designed, and used, installed and maintained in accordance with with the statements and conditions of Appraisal No.732 (2012), will meet the following provisions of the NZBC:

Clause B2 Durability: Performance B2.3.1(b), 15 years. Nuraply Nuratherm System meet this requirement
Clause E2 External Moisture: Performance E2.3.1 and 2.3.2. Nuraply Nuratherm System meet these requirements
Clause F2 Hazardous Building Materials: Performance F2.3.1. Nuraply Nuratherm System meet this requirement and will not present a hazard to people
Clause H1 Energy Efficiency: Performance H1.3.1(a). The Nuraply Nuratherm System will contribute to meeting this requirement

Nuraply Nuratherm System is appraised as an Alternative Solution in terms of New Zealand Building Code compliance.

BRANZ Appraised

Enertherm PIR Insulation Boards

Nuralite

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Enertherm PIR is a 100% CFC, HCFC or HFC-free insulation board with a rigid polyisocyanurate foam core, clad on both sides with a multi-layer gas-tight aluminium complex.

Enertherm boards can be installed over plywood, concrete or metal substrates, on new or existing buildings and on flat roofs with a minimum 1:30 slope.

IKO Enertherm ALU Insulation is installed as part of the Nuratherm System.

In the opinion of BRANZ, the Nuraply Nuratherm System if designed, and used, installed and maintained in accordance with with the statements and conditions of Appraisal No.732 (2012), will meet the following provisions of the NZBC:

Clause B2 Durability: Performance B2.3.1(b), 15 years. Nuraply Nuratherm System meet these requirements.
Clause E2 External Moisture: Performance E2.3.1 and 2.3.2. Nuraply Nuratherm System meet these requirements.
Clause F2 Hazardous Building Materials: Performance F2.3.1. Nuraply Nuratherm System meet these requirements and will not present a hazard to people.
Clause H1 Energy Efficiency: Performance H1.3.1(a). The Nuraply Nuratherm System will contribute to meeting this requirement.

Nuraply Nuratherm System have been appraised as an Alternative Solution in terms of New Zealand Building Code compliance.

BRANZ Appraised

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